Effect of Analytical Model of Top Foil Displacement on Predicted Maximum Load Carrying Capacity of Bump Foil Journal Bearings (Part 1)

  • HATAKENAKA Kiyoshi
    School of Computer Science and Systems Engineering, Kyushu Institute of Technology

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Other Title
  • バンプフォイル軸受の理論最大負荷容量に及ぼすトップフォイル変形解析モデルの影響(第1報)
  • バンプフォイル軸受の理論最大負荷容量に及ぼすトップフォイル変形解析モデルの影響(第1報)平面シェル要素の適用
  • バンプフォイル ジクウケ ノ リロン サイダイ フカ ヨウリョウ ニ オヨボス トップフォイル ヘンケイ カイセキ モデル ノ エイキョウ(ダイ1ポウ)ヘイメン シェル ヨウソ ノ テキヨウ
  • ―Application of Plate Shell Element―
  • ―平面シェル要素の適用―

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Abstract

<p>Bump foil journal bearings are prospective applicants that can support a small-sized rotor of high-speed rotary machinery. Some model bearings are used in predicting the characteristic performances of the bearings. In the previous study, the finite element (FE) method that adopted a curved-beam element was applied in analyzing the displacement of the bearing surface that is called as top foil. However, the model assumes that the air film thickness in the axial direction is constant, so the performance of foil journal bearings that has uneven air film thickness in the direction cannot be obtained. In this study, the top foil is assumed to be a thin shell. The displacement is analyzed by replacing the curved-beam element to a plate shell element. Although the replacement of the FE model is found to have a large influence on the performances, this is because the shell model cannot couple the membrane and the bending effects. It is concluded that the shell model is inappropriate to the prediction of the bearing performance and should be replaced to other type of shell model that can couple the two effects.</p>

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